Create your own at Storyboard ThatRodrigo and Iago tell Desdemona's father about her secret marriage to Othello and her father feels that Othello has drugged Desdemona into marrying him and is furious. After it was clear that Desdemona loved Othello, Iago couldn't resist the jealously that Cassio was lieutenant and he wasn't. Therefore he thought of a plan to get the job as lieutenant. He decided he would have a party and get Cassio the lieutenant drunk because he had to be on guard tonight for the moor, Othello. Then when Cassio was on duty he was drunk and Othello came and took away his position as lieutenant. Othello then presented Iago as the new lieutenant.